Wind recording apparatus



25, 1945' M. D; THOMAS ETAL WIND RECORDING APPARATUS Filed Sept. 21,1943 3 Sheets-Sheet 1 on u ljuu n'upu INV TOR6 film a M M, 6"

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M. D. THOMAS ET AL WIND RECORDING APPARATUS Filed Sept. 21, 1943 5Sheets-Sheet 2 WM MMLI: N rm h WH WI R 0mm G n 7 T TOENE Y Filed Sept.21, 1943 3 Sheets-Sheet 3 Y R m m H @0 M f Y B g v v .2 M NEE A APatented Dec. 25, 1945 WIND RECORDING APPARATUS James 0. Ivie, Salt LakeMoyer D. Thomas and City, Utah, assignors to American Smelting andRefining Company, New York, N. Y., a corporation of New JerseyApplication September 21, 1943, Serial No. 503,212

7 Claims.

This invention relates generally to recording devices and moreparticularly to apparatus for measuring and recording wind direction andvelocity.

It is frequently desirable in connection with systems for automaticallymeasuring and recording small concentration of sulphur dioxide in theatmosphere to know, in addition to the amount of S02 in the atmosphereat particular times or over an extended period of time, the directionand velocity of the wind when the concentration of the S02 is beingmeasured and recorded.

In some systems for measuring the S02 concentrations in the atmospherethere is provided automatic apparatus which periodically aspiratesmeasured amounts of the air being tested through measured quantities ofstandard reagents and of electrodes, the resistance between which ismeasured and recorded by suitable apparatus. Recording devices for thispurpose may be of any suitable standard types such, for example, as aLeeds & Northrup recorder. By the use of an automatic recorder of thekind mentioned a strip of ruled paper is driven over a cylinder at a.predetermined constant speed in timed relation with the operation of theaspirating absorption apparatus and one or more recording stylusesoperating in response to the current flowing through the gas absorbingreagent makes a running record which may be related by suitablecalibration to the current resistance so as to indicate the amount ofS02 in the atmosphere and in some instances, other volatile sulphurcompounds.

According to this invention there is provided apparatus adapted tomeasure and record wind velocity and direction which may be usedindependently of the devices for measuring and recording smallconcentrations of gases in the atmosphere but preferably it is used as apart of, or in combination with systems for measuring, indicating andrecording gas concentrations in the atmosphere. When used in conjunctionwith or as a part of a gas concentration recording system, the inventionprovides apparatus for producing a currently or continuously runningindication for any desired period of time, which, in addition toindicating and recording the concentrations of gases in the atmospherealso indicates and records at the same time the wind velocity anddirection at the place where the atmosphere is being tested.Consequently, there may be automatically produced a permanent chart orgraph of the various factors and conditions mentioned.

According to one form of the system of the invention, a rotatable shaftis connected through a universal joint to a sensitive standard Windvane. Mounted on the shaft is a wind direction cam which operates a Winddirection lever carrying a recording stylus to record wind direction ona moving paper strip carried 'by a standard recording device. Alsomounted on the same shaft is a wind direction orientation cam whichoperates a single pole double throw electrical switch arranged tooperate another recording stylus. The arrangement is such that each halfrevolution of the wind direction cam causes the wind direction stylus orpen, which is mounted on a pivoted lever, to travel a full are on therecording paper. The wind direction orientation stylus or pen operatesin response to rotation of the wind direction orientation cam toindicate in which arc of 360 the wind direction is. Another stylus isarranged to be operated in response to the movement of a standardanemometer to record wind velocity. By a special wiring circuit in thesystem the arrangement is such that wind direction, wind velocity andamount of air tested in the absorption apparatus may be currently orcontinuously indicated and recorded on the recording paper.

Although the novel features which are believed to be characteristic ofthis invention will be particularly pointed out in the claims appendedhereto, the invention itself, as to its objects and advantages, and themanner in which it may be carried out, may be better understood byreferring to the following description taken in connection with theaccompanying drawings forming a part thereof, in which Fig. l is apartial front view in elevation of a recording device embodying theinvention partly broken away cording wind direction and velocity andvolume of air aspirated and showing also the type of chart produced;

Fig. 2 is a partial rear view in elevation of the device shown in Fig. 1partly broken away but with the chart paper removed;

Fig. 3 is an end view of the device shown in Figs. 1 and 2 partly brokenaway;

Fig. 3a is a view showing a wind vane and shaft, broken away, which isconnected to the apparatus shown in Figs. 1, 2 and 3;

Fig. 4 is a view on line 4-4 of Fig. 2;

Fig. 5 is a view on line 5-5 of Fig. 2; and

but showing Styluses for re- Referring now to the drawings, I!)represents 2 the main frame of a typical recording device. Mounted forrotation in the frame is a cylinder II over which travels a strip ofchart paper I2 at a predetermined rate of speed. The cylinder I I isprovided at both ends with circumferentially arranged teeth I3 whichregister with corresponding rows of apertures I4 in the strip I2. Thecylinder I I is driven through a gear I5 fixed to the shaft of cylinderI I, which gear meshes with worm I6 fixed to shaft I'I having a gear I8meshing with worm IS on shaft 20. The mechanism is driven in aknownmanner. A gear 2| on shaft meshes with a pinion 22 on shaft 23'which isprovided with a gear 24 meshing with a worm-25 having aknob 26for'delicately adjusting the position of the cylinder II-and the engagedstrip I2 fordesired relative positionbetween the recordingpens of therecorder and the ordinates of'the chartpap'er. So much of'the apparatusas has been described is, standard and further detail is deemedunnecessary.

Mounted on the main frame I0 is'a frame, designated generally byreference character 30, which supports horizontal brackets 3i and 32.Mounted for rotation in suitable bearings in the brackets isa verticalshaft'33. This shaft is connected by means ofa universal joint 3 1110wind vane shaft which is connected to a wind vane 36 which may be of anydesirable standard construction. A bearing 31 may be provided as desiredfor mounting thewind vane shaft 35 for rotation. It will beunderstood-the wind vane will be exposed to the-wind where the apparatusis set up.

Fixedly but adjustably mounted on shaft 33 between the brackets 31and-32 are two cams, one

herein designated, for facilitating description, as the wind directionorientation camor north-south sector earn and the other, the winddirection cam 39. Cam 38 has a high camtrack section through 180 and alow cam track section 4| through the other 180 (see Fig. 4). Cam 39 isheart shaped and has one lobe t2 corresponding to the highsection 40 0fcam 38 and the other lobe 43- corresponding to the'low section M of cam38. The'relative positions of the two cams are shown in Figs. 3 and 4.

Adisc fi l-is mounted above bracket 3!. Ithas a eircumferential scalegraduated-in quadrants or degrees as in a compass-rose. A pointer 45adjust-ably fixed to shaft 33, as by set screw- 46, registers with thegraduated scale. The pointer is operated above the disc in response torotation of-the shaft to-which the weather vane is attached.This'arrangement is a convenience in setting upthe device and incalibrating the response of the wind direction recording pen to'themovement'of the vane.

Engaging the cam track of cam 38is a cam follower on cam lever 5|. Theopposite end of lever 5| is fixed to a bracket 52 mounted for rotationon pivot 53, on bracket 32 and a corresponding pivot 53a on bracket, 3|.A spring 5.4 yieldingly urges the cam follower 59 against the cam 38(see Fig. 4).; Mounted on the lever 5I between insulating blocks 55 is aswitch arm 56 of resilient conducting material. The free opposite end ofswitch arm 56 is provided with contact member 51 adapted on actuation oflever 5I to engage contact member 59 when the cam follower 5G is on thehigh cam track section 45 and a contact member 58 adapted to engagecontact member 60 when the cam followerti) ison the-flow cam tracksection M. The contact members "are mounted in spaced relation on thebracket 32 as shown in Fig. 4. This arrangement of the switch arm andcontact members, it may be noted, provides a single pole double throwswitch, the purpose of which isreferred to in more detail hereinafter.The contact members 59 and Gil are mounted in Spaced relation onconducting arms 69 and I0 respectively which are in turn mounted betweeninsulating blocks 'II secured to the bracket 32 (see Fig. 2).

Engaging the cam 39 is a cam follower GI on cam lever 52 which ismounted on a shaft 63 pivotally mounted in a bracket 64 secured to theframe 3flas by screws. The other section 65 'of the lever is secured tothe shaft '63. Thus, there is provided a pivotally mounted winddirection lever, designated generally by reference character 68-.- Thislever mounts a'recording pen BIS-by means of a hinged connection 67. Itwill be observed the pen 66 engages the chart paper I2 and makes amarkthereon corresponding to its movement over the paper (see Fig. l)which is responsive to the movementofthe cam follower BI-engaging cam 39(see Fig. 2) A spring 69 yieldingly urges the cam follower against thecam'S9."

Also secured to the frame 30 is a bracket I2 mounting a yoke ls'whichsupports an electromagnet it, comprising winding 75, and core F6. Anarmature arm If is mounted on the yoke to provide a lever, one end ofwhich is attached to a spring 'ffiwhich normally holds the armature indropped or out-of-contact position when the winding is not energized.When the magnet is energized the spring yields and the armature islifted and makes contact with the core. Hence, the pen whereindesignated for purposes of description as the wind velocity pen, whichis secured to the armature arm-TI will make a lateral mark on the chartpaper I2 in response to the movement of the armatureof theelectromagnet. The-wind velocity'electromagnet I4 is wired to a standardwind velocity anemometer (shown diagrammatically in Fig. 6)

and the arrangement is such that the wind velocity pen registers on thechart the passage of each mile of'wind by being drawn to one side at thetime when the armature 'I'Iis liftec1" to contact position.

Mounted on the frame It is another bracket 8'5 supporting electromagnet8 0 which comprises a. yoke 8| mounting the magnet having a-winding 82,core 83, and armature 84-. The armature is yieldingly urged toout-of-contact or dropped position-bye. spring 85. A recorder pen BI,herein designated for' purposes ofdescripltion as the winddirectionorientation pen, is fixed to armature arm B l andengages thechart paper I2'on cylinder II. When the magnet is energized the armaturewill be in lifted or-contact position and'the pen will make a marklongitudinally of i the strip I2 corresponding to the energized positionand when de-energized, the'p'en will be drawn slightly to the left asviewed in Fig. l SQ long as de-energizedwill make a mark longitudinallyQf the strip 12-110 the left of the marked line. correspondingto thedropped or out-of-contact position.

The magnet 80 is wired to the gas or air volume meter of the S02measuring and recording apparatus and also wired to be operated by thewind direction orientation cam 33. The gas or air meter 88 is showndiagrammatically in Fig. 6 and is wired to the same magnet 89 and thearrangement is such that upon passage Of each unit volume of air throughthe aspirating apparatus (not shown) the pen 8? is drawn laterall to oneside or the other of the longitudinal line indicating wind directionorientation. Accordingly, pen 8'! indicates and records not only a markindicating the wind direction whether generally north or south but alsoindicates and records the amount of air passing through the aspiratingapparatus to which the meter is connected.

The apparatus is wired as shown by the wiring diagram in Fig. 6 whereinis also shown schematically certain working elements and parts of theapparatus, the reference characters being insofar as practicable thesame as those of the other figures of the drawings.

The operation of the system may be better understood by reference toFig. 6 together with the other figures. By means of a transformer 90, asource 89 of 110 v. alternating current is reduced to, say 6 v. Wire 9!is connected to a contact member 92 on the anemometer 93. It will beunderstood the anemometer may be of any suitable standard type and isequipped to make electrical contact on each passage of a mile of wind.As the anemometer rotates in response to wind current, the conductingarm 94 rotates on axis 95 and on each revolution it represents I onemile of wind. Anemometer contact arm is connected to wire 96 which isconnected through winding 15 of electromagnet It, thence to wire 91,connected to wire 98.

Normally wind velocity armature ll will be in out-of-contact positionand will make a line 99 running longitudinally or parallel with thelength of paper strip 1 2 (see Fig. 1). Upon rotation of the contact arm94 of the anemometer (see Fig. 6) it will make contact with contactmember 92 upon the passage through the anemo-meter of each mile of wind.At the time of contact, current passes through wires 9!, arm 94, wire 96through the winding 15 of magnet M to energize it, through wires 97 and93. Upon energization, armature l! is lifted to contact position drawingthe pen i9 momentarily to the left as viewed in Fig. 1. When contact isbroken the pen 19 returns to normal position. Consequentl each laterallyextending mark it!) indicates the passage of one mile of wind. Inasmuchas the strip 12 passes under the pen at a uniform predetermined oradjusted lineal speed, the velocity of the wind at any given time may bedetermined by reference to the printed ordinate lines HM.

Referring again to Fig. 6, wire 52, connected to wire )3, to which isalso connected 98, is a contact member )4 on the gas or air meter 88. Itwill be understood that the gas meter 88 is arranged to measure thequantity of air passing through the air aspirating apparatus (notshown). Ordinarily meters used for this purpose indicate one cubic footof gas per each revolution of the main indicator hand, although, ofcourse, other meters may be utilized. Accordingly, the arrangement shownis such that upon each revolution of contact arm I 65, one cubic foot ofair passes through the meter. Contact arm I is of conducting materialand rotates on axis Hit.

The arm IE5 is electrically connected to wireil)? which is connected toa relay I93. Relay contact arm :09 is normally out of contact or indropped position and the contact member H0 normally makes contact withcontact member I l i connected to wire H2. Wire H2 also connects withcontact member Fill (see also Figs. 2 and 4). It may be here noted thatwhen cam follower 58 engages the lower half section 4! of wind directionorientation cam 38, contact member 58 on switch arm 56 engage contactmember 60 and current will flow through switch arm 56 which is connectedto wire H3 through winding 82 of Wind direction orientation magnet Eli,and through wire 98 connected to wire N33 to the transformer. Hence,magnet 8% is normally energized when the cam follower 59 engages the lowcam track section 4!. When magnet 85) is thus energized the armature 84is in lifted or contact position and pen 8? will make a mark H4 alongthe paper strip !2 to right as viewed in Fig. 1. When the magnet isde-energized the pen t? will make a mark I l along the paper, to theleft as viewed in Fig. 1. Fo example, when the cam follower 56 engagesthe high cam track section as of cam 38 the lever 5! causes switch arm55 to move away from the cam and causes contact between contact members57 and 59, but in that case normally no current will flow through magnet2 d and armature a l is in dropped or out-of-contact position and thewind direction orientation pen 8? will make a mark H5 parallel with thelength of the strip to the left as viewed in Fig. l.

The Wind direction pen 66 it will be observed is operated in response tothe movement of wind direction lever 68 which rocks on pivot 63 (seeFig. 2). As the heart-shaped cam 39 is rotated with shaft 33 is responseto the position taken by the wind vane 36, cam follower ti on lever 58engages either the cam track section 42 or 43. When the cam follower 6|engages the point on the cam nearest the axis of rotation of the cam thepen 66 swings to its furthest point on the chart to the left as viewedin Fig. l, for example to line I H, which indicates the wind directionis east. When the cam follower 5| engages the point on the cam at thepoint of the heart-shaped cam which is furthest from its axis, the penswings to the right as viewed in Fig. 1, for example to line H8, itsfurthest position to the right which indicates the wind direction is wst. Inasmuch as the wind may be in a direction which is, for example, N.E. or N. W., and inasmuch as some arrangement is necessary to indicatewhether the cam follower is engaging lobe 42 or 43 to determine whetherthe wind direction generally is north or south, the low section 3! ofcam 38 corresponds to lobe 43 and the high section so of cam 38corresponds to lobe 32. Hence, when cam follower 56 is on the low side1H, cam follower 6i is on lobe 43 and since contacts 58 and. 60 are thusengaged, current is normally flowing through winding 82 of magnet thismagnet is energized and pen makes a mark H4 (see Figs. 1 and 6).Accordingly, the mark made by pen 66 opposite mark M4 on the chartindicates the wind direction is generally north. If the wind directionis directly north the pen 66 will register on the center line H6 whichmay conveniently be printed on the chart as well as the ordinates liii.If the wind direction is N. the pen 66 will swing to the left of thecenter line I [6. Accordingly, by taking into consideration the furthestdistance to the left (as viewed in Fig. 1), the pen 66 can swing, it isan easy matter to determine'how far east from N. the wind is blowing.Likewise, if the wind direction is N. W., the pen swings to theright ofline I 56.

On the other hand, if the wind direction is generally south, the highsection 48 of cam 88 engages cam follower 50-and lobe Q2 of cam engagescam follower 61. Under this set of. conditions electrical contacts 58and 60 are disengaged and current is not normally flowing throughwinding 82 of magnet 80 which is then normally de-energized. Under thisset of conditions pen 8'! will make a mark I I parallel with the lengthof the paper strip I2, to the left of mark I Hi. This indicates the windis'blowing in a generally south direction. If pen 66 is on center line II6 opposite mark II5, this indicates the wind direction is due south. Ifthe pen swings to the left of line H6, it indicates S. E. and how mucheast of south can be determined by reference to line II'I'the furthestto the left the pen can swing. Likewise, when pen 66 swings to the rightof line I IE, it indicates how much to the west of south the winddirection is.

Summarizing briefly, by observing the graph I I9 made by pen BB andnoting whether the mark made by pen'8I is to the right (mark I I4) orthe left (mark H5), it can be determined whether the wind direction atany time was in the N. E. or N. W. quadrant or the S. E. or S. W.quadrant of the compass rose and also the exact wind direction may bedetermined from the chart.

Pen 8'! may also be utilized to serve an additional purpose, to wit,indicate and record the amount of air aspirated through the S02 testingapparatus (not shown), It will be understood the gas meter 88 (see Fig.6) is connected to measure the quantity of air passing through theabsorption or aspirating apparatus. Usually, each revolution of thelarge hand of the meter indicates the passage of one cubic foot of air.According to the invention, contact arm I05 makes contactwith contactmember I04 for each revolution corresponding to one cubic foot of airpassing through the meter. At the time of contact, current will flowthrough wire I02, contact arm I05, wire I01, through relay coil I08, andWire 0! to energize the relay coil and cause contact arm I69 to breakthe contact between contacts H0 and III.

Hence, when cam follower 50 is on low side 4| of cam 38 (when pen 8? isto (the right to make mark I I4-see Fig. 1 and Fig. 6) contact ofmembers I04 and I05 causes break of contacts H0 and III and at that timethe circuit through winding 82 of magnet 80 is momentarily'broken, andthe magnet 88 momentarily de-energized. At this moment, armature 84 isdropped, the pen 8! makes a lateral mark I and thenreturns to continuemark H4 along the length of the paper, since breaking of contact betweencontact member H34 and arm I05 of the meter permits armature arm I09 toreturn to normal position to complete the circuit flowing currentthrough winding 82, It will thus be observed that each short lateralmark I28 on the chart indicates the passage of one cubic foot of gasthrough the absorption apparatus. Since the paper strip moves linearlyat uniform speed the marks parallel with the length of the paper stripcorrespond to abscissae representing time, the lines l0l runningcrosswise having been referred to as ordinates. Consequently, the volumeof gas tested is shown on the chart by the short lateral line made bypen 81.

In the event that cam follower 50 engages cam section 40, that is whenpen 8? is to the left making mark H5, it will be observed that magnet isnormally deenergized. However, contact member 5'I'engages contact member59 which is connected by a wire I2I to contact member I22. Under thisset of conditions, when contact arm I05 engages contact IB S on themeter as air continues to flow through the meter, relay I08 is energizedmomentarily to cause relay arm I09 to make contact with member I22.Consequently, current momentarily flows through the winding 82' ofmagnet80 and causes pen 8'! 7150 be drawn momentarily to the right as armature84 is momentarily lifted. Thus'pen 81 makes a short lateral mark I20a.to the right of the mark H5 (see Fig. 1) for each cubic foot of airpassing through the meter.

The marks I3I on the extreme left of chart paper strip I2 represent thegraph made by the S02 recorder pen I32, the laterally extending marksI33 indicating the change from one set of absorbers to another set ofabsorbers in the S02 absorption apparatus. This aspect of the apparatusis known to those skilled in the art and a detailed discussion is deemedto be superfluous; Suffice it to say, the recording instrument is in aknown manner calibrated to indicate the S02 concentration in the airbeing tested; Lt is significant to note, however, that the graph i3Iis'correlated with the wind direction graph I I8, the wind velocitygraph 99 and the wind direction orientation graph I I4, I I5, the latteralso serving to record the volume of air tested, the S02 content ofwhich is indicated by graph I3I.

It will be'seen from the foregoing description that the inventionprovides a system whereby a running record may be made in the form of anautomatically produced chart which will show for any particular time andfor any period of time, the concentration of S02 in the atmosphere, theamount of air tested, the wind direction and the wind velocity. Suchcharts being valuable not only for current testing or for obtainingintelligence at a. particular time are also particularly suitable forpermanent records as the system can be operated for short or longperiods with very little manual effort or personal attention.

While certain novel'features of the invention have been disclosed andare pointed out in the claims, it will be understood that variousomissions, substitutions and changes may be made by those skilled in theart without departing from the spirit of the invention comprehended bythe annexed claims,

What is claimed is:

1. An apparatus for use with a record producing instrument for recordingconcentration of S02 in the atmosphere having means for supporting arecord strip, means for moving said strip at a predetermined speed,means for recording S02 concentration, and a meter for measuring theamount of air tested which apparatus comprises a wind vane mounted forrotation, a first markingdevice to engage said strip and operative inresponse to the movement of said wind vane in either of its two arcs ofrotation about its axis of rotation, asecond-marking device toengagesaid strip and operative in response to rotation of said'windvane torecord in which of the two said arcs said'wind vane is operating atanygiven time, and means including an electromagnet connected with saidmeter to cause said second marking device also to record the amount ofair measured by said meter.

2. A wind direction recording instrument which comprises means forsupporting a record strip, means for moving said strip at apredetermined speed, a weather vane mounted for rotation in response tochange in wind direction, a first marking device adapted to record itsmovement on said strip, means including a heart-shaped cam between saidweather vane and first marking device to operate said marking device inresponse to rotation of said weather vane in either of its two 180 arcsof rotation about its axis of rotation, a second marking device adaptedto record its movement on said strip, and means including a cam having alow cam track through 180 and a high cam track through 180 between saidsecond marking device and said weather vane to cause said second markingdevice to record on said strip in which of its two 180 arcs said windvane operates at a given time.

3. A wind direction recording instrument which comprises means forsupporting a record strip, means for moving said strip at apredetermined speed, a weather vane mounted for rotation in response tochange in wind direction, a shaft mounted for rotation in response torotation of said weather vane, a first marking device adapted to recordits movement on said strip, means including a cam having a heart-shapedcam track mounted on said shaft to operate said first marking device inresponse to rotation of said weather vane in either of its two 180 arcsof rotation about its axis of rotation, a second marking device adaptedto record its movement on said strip, and a cam having a high and a lowcam track section mounted on said shaft to cause said second markingdevice to record on said strip in which of said two 180 arcs said windvane operates at a given time.

4. An apparatus for use with a record producing instrument having meansfor supporting a record strip and means for moving said strip at apredetermined speed which comprises, a wind vane mounted for rotationthrough 360 about its axis of rotation, a shaft rotatable in response tothe rotation of said wind vane, a wind direction orientation cam and awind direction cam rotatable in response to rotation of said shaft, awind direction orientation marking device to engage and make a record onsaid strip, a wind direction marking device to engage and make a recordon said strip, said wind direction orientation cam having a high and alow section cam track, said wind direction cam having a heart-shaped camtrack, a cam lever engaging said orientation cam and arranged to causeoperation of said wind direction orientation marking device to make onemark on said strip when said cam lever engages the low section of itscam and to make another mark on said strip when said cam lever engagesthe high section of its cam, and a cam lever engaging said heart-shapedcam to operate said wind direction marking device.

5. An apparatus for use with a record producing instrument for recordingS02 concentrations in the atmosphere having means for supporting arecord strip, means for moving said strip at a predetermined speed and ameter for measuring the amount of air tested which apparatus comprises,a wind vane mounted for rotation through 360 about its axis of rotation,a shaft rotatable in response to the rotation of said wind vane, a winddirection orientation cam and a wind direction cam rotatable in responseto rotation of said shaft, a wind direction orientation marking deviceto engage and make a record on said strip, a wind direction markingdevice to engage and make a record on said strip, said wind directionorientation cam having a high and a low section cam track, said winddirection cam having a heart-shaped cam track, a cam lever engaging saidorientation cam and arranged to cause operation of said wind directionorientation marking device to make one mark on said strip when said camlever engages the low section of its cam and to make another mark onsaid strip when said cam lever engages the high section of its cam, acam lever engaging said heart-shaped cam to operate said wind directionmarking device, and means connected with said meter to cause said winddirection orientation marking device also to make marks on said stripindicating the amount of air measured by said meter in addition to saidmentioned marks.

6. In a system for recording wind direction simultaneously withrecording of S02 concentration in the atmosphere, a meter for measuringthe amount of air tested, means for supporting a record strip upon whichis recorded a graph indicating S02 concentration, a weather vane mountedfor rotation, a first cam operative in response to rotation of saidweather vane, a first marking device operative in response to rotationof said first cam in either of the two 180 arcs of rotation of saidweather vane about its axis, a second cam operative in response torotation of said weather vane, a second marking device operative inresponse to rotation of said second cam to record on said strip marks toshow in which of said arcs said weather vane operates at any time, saidsecond marking device being operative to make marks indicating winddirection orientation and said first marking device being operatve tomake a graph indicating wind direction, and means operative in responseto the operation of said meter to cause said second marking device tomake marks on said strip to indicate the amount of air passing throughsaid meter.

7. Apparatus, for use with a record producing instrument for recordingS02 concentrations in the atmosphere having a record strip and means formoving said strip at a predetermined speed, to correlatively record windvelocity and direction with the S02 concentration record on said strip,which apparatus comprises: first, second and third marking devices, aframe mounting said first, second and third marking devices, said firstmarking device being connected to an anemometer and operativelyresponsive thereto to record wind velocity on said record strip, a windvane mounted for rotation through 360, a wind orientation cam and a winddirection cam operative in response to rotation of said vane, said windorientation cam being connected to said second marking device forrecording on said strip which of two arcs of rotation said vane isoperating in, and said wind direction cam being connected to said thirdmarking device for recording the movement of said vane on said strip.

MOYER D. THOMAS. JAMES O. IVIE.

